Baldur Gislason wrote:
> I have powered leds from the parallel port, there's about 10mA of current
> available on each data pin without destroying anything. so I wired 8 leds,
> each with a 330 ohm series resistor, no external power supply.
Use 470 ohm; your chip will last longer with all bits lit
I have powered leds from the parallel port, there's about 10mA of current
available on each data pin without destroying anything. so I wired 8 leds,
each with a 330 ohm series resistor, no external power supply.
Baldur
On Sunday 27 October 2002 22:48, you wrote:
> On Mon, 28 Oct 2002 [EMAIL PRO
It seems Ronald G Minnich wrote:
> On Mon, 28 Oct 2002 [EMAIL PROTECTED] wrote:
>
> > As far as I remember, there is open collector output
> > on parallel port, so your wish impossible %-)
>
> oops, I forgot that little deal. Yup, you need a pullup.
Only the control signals are OC, the databits
On Mon, 28 Oct 2002 [EMAIL PROTECTED] wrote:
> As far as I remember, there is open collector output
> on parallel port, so your wish impossible %-)
oops, I forgot that little deal. Yup, you need a pullup.
you can get PP relay modules for not much.
ron
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Put a voltmeter on the PP port. Measure voltage.
put am ammeter on the PP port. measure current. (start at 10 amps to be
safe, trust me, you're not going to cause the ammeter any trouble).
See if Voc and Isc are in a usable range. If not, go get yerself a little
reed relay or solid state relay.
David Nicholas Kayal wrote (on Oct 27):
> int main()
> {
> int fd;
> while(1)
> {
> ioctl(fd, PPISDATA, 255);
> }
> }
Doesn't "fd" normally need to have a value, such as that of a valid
descriptor before you ioctl() it? Like:
fd = open("/dev/ppi0", O_RDWR);
Chris.
--
> I got a LED and touched it to the positive and negative ends of two 1.5v
> AA batteries in a serial configuration.
> The LED lit up. I then crimped on pins to the end of the LED wires and
> again tested it with the batteries. Again, I saw the light.
>
> I plugged said tinned pins into the 2nd
I got a LED and touched it to the positive and negative ends of two 1.5v
AA batteries in a serial configuration.
The LED lit up. I then crimped on pins to the end of the LED wires and
again tested it with the batteries. Again, I saw the light.
I plugged said tinned pins into the 2nd and 25th pin
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